Make MRCA dict into a class

Walkthrough

The GeneticInheritanceGraphLibrary underwent significant updates to enhance its functionality and usability. Notably, the handling of Most Recent Common Ancestor (MRCA) intervals has been revamped with the introduction of the MRCAdict class, which consolidates previous functionalities and adds the capability for random position selection within MRCA regions. This refinement aims to streamline genetic inheritance graph analyses and simulations, making them more intuitive and efficient.

Changes

File(s)	Change Summary
`GeneticInheritanceGraphLibrary/tables.py`	Introduced `MRCAdict` class for advanced MRCA interval handling, integrating previous functionalities and enhancing random position selection.
`tests/gigutil.py` `tests/test_tables.py`	Adjusted to utilize the new `MRCAdict` class for random position selection, reflecting a shift in how MRCA-related functionalities are accessed and organized.
`tests/test_gigutil.py`	Updated to import the library as `gigl` and use `MRCAdict` for calculating comparable points, changing the approach to determining comparable points in tests.

Related issues

github/hyanwong/GeneticInheritanceGraphLibrary#78: The enhancements made to MRCA interval handling and the potential for improved data extraction and visualization tools could directly support the objectives outlined in this issue, particularly in developing visualization tools for GIGs and their algorithms.

🐰✨
In the world of genes and graphs, we hop,
With MRCAdict now, our work does not stop.
From intervals to points, so precise,
Our genetic maps, now thrice as nice.
Oh, how the data flows and entwines,
In the library's heart, where code combines.
🌟🐇

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hyanwong / giglib